Modern Vespa

So managed to get the speedo from SIP today, threw it on the PX, looks great but couldn't make it work without a battery hooked up to the setup…

Ray8, unfortunately the speedo doesn't even power on with a 9v battery, unless I'm missing something. but it did worked with a 12v battery (something tells me it needs around 10v becos the instructions did mention to measure the headlight positive and look for 10.5-12.5v)

So back to square one. I hooked the speedo and ac converter (included with the speedo) according to the instructions and the video… so black box connected to the headlight, but voltage was around 7-8v… counter measures 800rpm (that was when it was powered with the 12v battery)

But disconnected the battery and there's no counter… switches off…

am I missing something?

I've taken away the horn and the starter safety switch… would that make a difference??

Also, the speedo having a typical regulator we are use to is wrong, too. The black box is the speedo computer and has something in it to make sure it does not fry from too much power but not a typical regulator.

Yours is an older version? Was hoping they solved that issue with earlier incarnations.

The power box's description says 12v AC/DC to 4v DC regulator.

If you plan on using the temp sensor on the speedo you'll have to run the small wire provided from the Black box to motor spark plug. You do have options of where you want to place the black box. Some place it in the headset, some place it under the horncast and some place it at the back of scooter on the battery/regulator side. I didn't like mine in the headset so I ran the main large wire provided to the back and placed the black box near bike's regulator. Easier for me to get to. Don't know if you will have room in headset for black box and KOSO converter.